So we have the covalent Radii of Ga = 1.26 A and As = 1.19 A. And the structure is Zinc blende with arsenic occupying half of the tetrahedral sites. So its probably not close packed....(adsbygoogle = window.adsbygoogle || []).push({});

The formula the works for me is, [4/sqrt(3)] x [ radius of Ga + radius of As ]. I can get the answer ( 5.66 A ) by this but I dont know why or how it works? Can someone please explain the reasoning behind it.

Also I noticed this is like the formula for the Body centre cubic packing. Is there any corelation?

thx....

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# Lattice length for Zincblende structures

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